Wand white_threshold() function – Python

The white_threshold() function is an inbuilt function in the Python Wand ImageMagick library which is used to force all pixels above the threshold into white while leaving all pixels below the threshold unchanged. 

Syntax:

white_threshold(color)

Parameters: This function accepts single parameters as mentioned above and defined below:  

• color: This parameter stores the value of the color as string like ‘green’, ‘white’, ‘red’.

Return Value: This function returns the Wand ImageMagick object.

Original Image:

Example 1:

Python3

# Import library from Image
from wand.image import Image

# Import the image
with Image(filename ='../geeksforgeeks.png') as image:
    # Clone the image in order to process
    with image.clone() as white_threshold:
        # Invoke white_threshold function with "Green" color
        white_threshold.white_threshold("green")
        # Save the image
        white_threshold.save(filename ='white_threshold1.jpg')

Output:

Example 2:

Python3

# Import libraries from the wand
from wand.image import Image
from wand.drawing import Drawing
from wand.color import Color

with Drawing() as draw:
    # Set Stroke color the circle to black
    draw.stroke_color = Color('black')
    # Set Width of the circle to 2
    draw.stroke_width = 1
    # Set the fill color to 'White (# FFFFFF)'
    draw.fill_color = Color('white')

    # Invoke Circle function with center at 50, 50 and radius 25
    draw.circle((200, 200), # Center point
                (100, 100)) # Perimeter point
    # Set the font style
    draw.font = '../Helvetica.ttf'
    # Set the font size
    draw.font_size = 30

    with Image(width = 400, height = 400, background = Color('# 45ff33')) as pic:
        # Set the text and its location
        draw.text(int(pic.width / 3), int(pic.height / 2), 'GeeksForGeeks !')
        # Draw the picture
        draw(pic)
        # Invoke white_threshold function with "red" color
        pic.white_threshold("red")
        # Save the image
        pic.save(filename ='white_threshold2.jpg')

Output: